Manufacture of metallic alloys.



UNIT D STATES Patented January 31, 1905..

PATENT OFFICE.-

THOMAS PRESCOTT, or HUDDERSEIELD, ENGI AND.

MANUFACTURE OF METALLIC.) ALLOYS- SPECIFICATION forming part of Letters Patent No. 781.500, dated January 31,1905. Applieation fil ed February 2, 1904. Serial No. -191;713.

Tultilwhen) it may concern:

Be it known that I, THoMAs' PRESCOTT, a subject of the king of Great Britain, residing at Lindenthorpe, Birkley HallRoad, Huddersfield, Englaridliave invented certain new and useful [1111)!(ii6f1101'1t8i1'1 the Manufacture of Metallic Alloys, of which the following is a specification.

The object of this invention'is to manufacture metallic alloy of alight and strong character suitable for bearings of machinery and for figures, models, and other Objects which can be prod'ucedfrom cast or stamped metals. I v

For the purpose'ot' this-.in vention the following ingredients "are employed: zinc, aluminium, iron, and silicon. lttis preferred that the ingredients be in or about the following proportions, the quantity of each constituent, by weight, varying according to the degreoof hardness or" toughness of'metal required: zinc, 53.50 to 74.75 parts; aluminium, twenty-line'to 43.50 parts; iron, 0.25 to two parts; silicon, 0.25 to one part. The silicon is formed'from a powder made of the following constituents: potassium silico fluorid, 23.25 parts; calcium chlorid, 25.82 parts; powdered glass, 31.20 parts; carbonate of soda, 3.72 parts; "carbonate of lime, 3.10 parts; common salt, 12.91 parts.

I In making the alloy the amount of iron re quired is first melted in a crucible and the aluminium is then added, and when'this is thoroughly melted add the zinc in the usual way, care being taken that the temperature is not too high when adding the zinc, as the latter being a volatile metal there would be considerable loss if this condition was not obseri ed. \Vhn these-have become thoroughly alloyed, the silicon in the form of powder is added, and in application'this powder is spread over the surface of the molten metal, and the silicon contained inthe powder enters into combination with the alloy, leaving a silicon on the surface of metal which is a strong deoxidizer and reduces the oxide that areformed during the alloying. If a hard metal is required the proportion of zinc and thatof aluminiumsmall. p

This alloymay be used for pattern-plates or patterns for founding-work, machine-bearings, a'nd for any articles where lightness com- I bined'jwith strength is required.

" WhatI claim, and desire to secure by Letters Patent, is Y by 1. The method ofmaking metallic alloy for casting, which consists in melting aquantity of iron, add-ing aluminium and zinc to the molten iron, thoroughly melting and alloying the .mixture, and finally adding silicon, as set forth.

2; The method of making metallic alloy for casting,- which consists in melting a quantity of iron, adding aluminium and zinc to the molten mass in succession, thoroughly melting and alloying the mixture, and-finally adding silicon when the alloy is ready for casting, as set' forth. 3. The method of making metallic alloy for casting, which consists in melting 0.25 to two parts of iron, adding twenty-five to 43.50

parts of aluminium and25'..50 to 74.75 parts of Zinc, thoroughly meltingand alloying the mixture, then adding 0.25 to one part of silicon when the alloy is ready for casting, as set forth. v

4. The method. of making metallic alloy for casting, which consists in thoroughly melting and alloying iron, aluminiumand zinc, then spreading on the molten alloy a powdered -mixture of potassium silico fluorid, calcium chlorid, glass, carbouateof soda, carbonate of lune, and common salt, as set forth.

In testimonywhereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS PRESCOTT, Witnesses:

ALFRED STANLEY HoUoHToN, ROBERT WILL' AM WATso-N.

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